var num = 200;
var w = window.innerWidth;
var h = window.innerHeight;
var max = 100;
var _x = 0;
var _y = 0;
var _z = 150;
var dtr = function (d) {
  return (d * Math.PI) / 180;
};

var rnd = function () {
  return Math.sin((Math.floor(Math.random() * 360) * Math.PI) / 180);
};
var dist = function (p1, p2, p3) {
  return Math.sqrt(
    Math.pow(p2.x - p1.x, 2) +
    Math.pow(p2.y - p1.y, 2) +
    Math.pow(p2.z - p1.z, 2)
  );
};

var cam = {
  obj: {
    x: _x,
    y: _y,
    z: _z
  },
  dest: {
    x: 0,
    y: 0,
    z: 1
  },
  dist: {
    x: 0,
    y: 0,
    z: 200
  },
  ang: {
    cplane: 0,
    splane: 0,
    ctheta: 0,
    stheta: 0
  },
  zoom: 1,
  disp: {
    x: w / 2,
    y: h / 2,
    z: 0
  },
  upd: function () {
    cam.dist.x = cam.dest.x - cam.obj.x;
    cam.dist.y = cam.dest.y - cam.obj.y;
    cam.dist.z = cam.dest.z - cam.obj.z;
    cam.ang.cplane =
      -cam.dist.z /
      Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
    cam.ang.splane =
      cam.dist.x /
      Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
    cam.ang.ctheta =
      Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) /
      Math.sqrt(
        cam.dist.x * cam.dist.x +
        cam.dist.y * cam.dist.y +
        cam.dist.z * cam.dist.z
      );
    cam.ang.stheta =
      -cam.dist.y /
      Math.sqrt(
        cam.dist.x * cam.dist.x +
        cam.dist.y * cam.dist.y +
        cam.dist.z * cam.dist.z
      );
  }
};

var trans = {
  parts: {
    sz: function (p, sz) {
      return {
        x: p.x * sz.x,
        y: p.y * sz.y,
        z: p.z * sz.z
      };
    },
    rot: {
      x: function (p, rot) {
        return {
          x: p.x,
          y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
          z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
        };
      },
      y: function (p, rot) {
        return {
          x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
          y: p.y,
          z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
        };
      },
      z: function (p, rot) {
        return {
          x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
          y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
          z: p.z
        };
      }
    },
    pos: function (p, pos) {
      return {
        x: p.x + pos.x,
        y: p.y + pos.y,
        z: p.z + pos.z
      };
    }
  },
  pov: {
    plane: function (p) {
      return {
        x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
        y: p.y,
        z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
      };
    },
    theta: function (p) {
      return {
        x: p.x,
        y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
        z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
      };
    },
    set: function (p) {
      return {
        x: p.x - cam.obj.x,
        y: p.y - cam.obj.y,
        z: p.z - cam.obj.z
      };
    }
  },
  persp: function (p) {
    return {
      x: ((p.x * cam.dist.z) / p.z) * cam.zoom,
      y: ((p.y * cam.dist.z) / p.z) * cam.zoom,
      z: p.z * cam.zoom,
      p: cam.dist.z / p.z
    };
  },
  disp: function (p, disp) {
    return {
      x: p.x + disp.x,
      y: -p.y + disp.y,
      z: p.z + disp.z,
      p: p.p
    };
  },
  steps: function (_obj_, sz, rot, pos, disp) {
    var _args = trans.parts.sz(_obj_, sz);
    _args = trans.parts.rot.x(_args, rot);
    _args = trans.parts.rot.y(_args, rot);
    _args = trans.parts.rot.z(_args, rot);
    _args = trans.parts.pos(_args, pos);
    _args = trans.pov.plane(_args);
    _args = trans.pov.theta(_args);
    _args = trans.pov.set(_args);
    _args = trans.persp(_args);
    _args = trans.disp(_args, disp);
    return _args;
  }
};

(function () {
  "use strict";
  var threeD = function (param) {
    this.transIn = {};
    this.transOut = {};
    this.transIn.vtx = param.vtx;
    this.transIn.sz = param.sz;
    this.transIn.rot = param.rot;
    this.transIn.pos = param.pos;
  };

  threeD.prototype.vupd = function () {
    this.transOut = trans.steps(
      this.transIn.vtx,
      this.transIn.sz,
      this.transIn.rot,
      this.transIn.pos,
      cam.disp
    );
  };

  var Build = function () {
    this.vel = 0.04;
    this.lim = 360;
    this.diff = 200;
    this.initPos = 100;
    this.toX = _x;
    this.toY = _y;
    this.go();
  };

  Build.prototype.go = function () {
    this.canvas = document.getElementById("canv");
    this.canvas.width = window.innerWidth;
    this.canvas.height = window.innerHeight;
    this.$ = canv.getContext("2d");
    this.$.globalCompositeOperation = "source-over";
    this.varr = [];
    this.dist = [];
    this.calc = [];

    for (var i = 0, len = num; i < len; i++) {
      this.add();
    }

    this.rotObj = {
      x: 0,
      y: 0,
      z: 0
    };
    this.objSz = {
      x: w / 5,
      y: h / 5,
      z: w / 5
    };
  };

  Build.prototype.add = function () {
    this.varr.push(
      new threeD({
        vtx: {
          x: rnd(),
          y: rnd(),
          z: rnd()
        },
        sz: {
          x: 0,
          y: 0,
          z: 0
        },
        rot: {
          x: 20,
          y: -20,
          z: 0
        },
        pos: {
          x: this.diff * Math.sin((360 * Math.random() * Math.PI) / 180),
          y: this.diff * Math.sin((360 * Math.random() * Math.PI) / 180),
          z: this.diff * Math.sin((360 * Math.random() * Math.PI) / 180)
        }
      })
    );
    this.calc.push({
      x: 360 * Math.random(),
      y: 360 * Math.random(),
      z: 360 * Math.random()
    });
  };

  Build.prototype.upd = function () {
    cam.obj.x += (this.toX - cam.obj.x) * 0.05;
    cam.obj.y += (this.toY - cam.obj.y) * 0.05;
  };

  Build.prototype.draw = function () {
    this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
    cam.upd();
    this.rotObj.x += 0.1;
    this.rotObj.y += 0.1;
    this.rotObj.z += 0.1;

    for (var i = 0; i < this.varr.length; i++) {
      for (var val in this.calc[i]) {
        if (this.calc[i].hasOwnProperty(val)) {
          this.calc[i][val] += this.vel;
          if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
        }
      }

      this.varr[i].transIn.pos = {
        x: this.diff * Math.cos((this.calc[i].x * Math.PI) / 180),
        y: this.diff * Math.sin((this.calc[i].y * Math.PI) / 180),
        z: this.diff * Math.sin((this.calc[i].z * Math.PI) / 180)
      };
      this.varr[i].transIn.rot = this.rotObj;
      this.varr[i].transIn.sz = this.objSz;
      this.varr[i].vupd();
      if (this.varr[i].transOut.p < 0) continue;
      var g = this.$.createRadialGradient(
        this.varr[i].transOut.x,
        this.varr[i].transOut.y,
        this.varr[i].transOut.p,
        this.varr[i].transOut.x,
        this.varr[i].transOut.y,
        this.varr[i].transOut.p * 2
      );
      this.$.globalCompositeOperation = "lighter";
      g.addColorStop(0, "hsla(255, 255%, 255%, 1)");
      g.addColorStop(0.5, "hsla(" + (i + 2) + ",85%, 40%,1)");
      g.addColorStop(1, "hsla(" + i + ",85%, 40%,.5)");
      this.$.fillStyle = g;
      this.$.beginPath();
      this.$.arc(
        this.varr[i].transOut.x,
        this.varr[i].transOut.y,
        this.varr[i].transOut.p * 2,
        0,
        Math.PI * 2,
        false
      );
      this.$.fill();
      this.$.closePath();
    }
  };
  Build.prototype.anim = function () {
    window.requestAnimationFrame = (function () {
      return (
        window.requestAnimationFrame ||
        function (callback, element) {
          window.setTimeout(callback, 1000 / 60);
        }
      );
    })();
    var anim = function () {
      this.upd();
      this.draw();
      window.requestAnimationFrame(anim);
    }.bind(this);
    window.requestAnimationFrame(anim);
  };

  Build.prototype.run = function () {
    this.anim();

    window.addEventListener(
      "mousemove",
      function (e) {
        this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
        this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
      }.bind(this)
    );
    window.addEventListener(
      "touchmove",
      function (e) {
        e.preventDefault();
        this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
        this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
      }.bind(this)
    );
    window.addEventListener(
      "mousedown",
      function (e) {
        for (var i = 0; i < 100; i++) {
          this.add();
        }
      }.bind(this)
    );
    window.addEventListener(
      "touchstart",
      function (e) {
        e.preventDefault();
        for (var i = 0; i < 100; i++) {
          this.add();
        }
      }.bind(this)
    );
  };
  var app = new Build();
  app.run();
})();
window.addEventListener(
  "resize",
  function () {
    canvas.width = w = window.innerWidth;
    canvas.height = h = window.innerHeight;
  },
  false
);